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Help ID my transmission #1311437 Tue May 21 2019 09:01 PM
Joined: Jun 2010
Posts: 245
B
bztguy Offline OP
Shop Shark
I could use some help ID'ing the the transmission in my 70 GMC half ton. I need to get a seal kit for it. It's a stock 3 speed manual mated to the original 307. The casting numbers are a little hard to read on the LH side but appear to be like 3862845. The RH side 8825647.


Thanks for the help.


1949 Chevy 3600
1975 W-25 Hurst Olds
1991 Chevy Silverado
1970 GMC 1/2 ton Fleetside

I'm a GM man!
Re: Help ID my transmission [Re: bztguy] #1311439 Tue May 21 2019 09:15 PM
Joined: Feb 2004
Posts: 19,016
H
Hotrod Lincoln Offline
Boltergeist
It's probably a Saginaw. How many bolts are there holding the side cover onto the case? Saginaw 3 speeds have 7 bolts, and Muncie SM 318's have 4 bolts. By 1970, I'm pretty sure all the 3 speeds were Saginaw.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Help ID my transmission [Re: bztguy] #1311581 Thu May 23 2019 02:09 AM
Joined: Jun 2011
Posts: 2,799
Happy Birthday EdPruss Offline
Shop Shark
One can always carefully remove the seals and get the PN off them.

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
Re: Help ID my transmission [Re: EdPruss] #1311583 Thu May 23 2019 02:25 AM
Joined: Jun 2010
Posts: 245
B
bztguy Offline OP
Shop Shark
Well it has 7 bolts making it a Saginaw. I see Rock Auto has seal/gasket/bearing kits for it for about 90 bucks. My own stupid fault. I'm restoring the truck and had it disassembled down to nothing but the cab on the frame. The trans was working fine so I left it as is other than a new clutch, flywheel, and throw out bearing. I didn't stop to think about the fact the truck had been sitting for years. After about 50 miles of shakedown driving the old dried front seal is now leaking......now that the truck is 95% complete......argh....


1949 Chevy 3600
1975 W-25 Hurst Olds
1991 Chevy Silverado
1970 GMC 1/2 ton Fleetside

I'm a GM man!

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